Sr.Client Security Engineer

Location: Tokyo, Japan(On-board in China)

Scopely's Security team is looking for a Sr Client Security Engineer to build a new client security function in China. You will design and ship client/server-side protections for large-scale mobile games, combat sophisticated cheating ecosystems, and help ensure fair play for tens of millions of players.

• Build, and grow the Client Security team in China, setting China specific technical direction, and operational best practices.

• Design, implement, and maintain client-side detections against third‑party cheating tools, modified clients, hooking frameworks, and emulators on Android and iOS.

• Own the client security integration into Scopely's internal anti-cheat platforms working closely with teams to ensure detections are actionable and scalable.

• Define and evolve the obfuscation and hardening strategy for China mobile builds (e.g., binary protection, anti-debugging, anti-tamper, integrity checks), including evaluating and integrating third‑party hardening vendors where appropriate.

• Build and maintain strong coverage for the China mobile ecosystem, including:

• distribution through multiple Android app stores and OEM devices,

• diverse OS/ROM variants and rooted/jailbroken environments,

• and local PC/emulator-based cheating patterns.

• Contribute hands-on code (C++ plus Java/Kotlin and/or Objective‑C/Swift) in security‑sensitive paths, including detection logic, integrity checks, and secure client–server protocols.

• Experience in mobile security, game anti-cheat, or client-side security engineering, including time working directly on Android or iOS native code.

• Direct experience with reverse engineering.

• Deep hands-on experience with:

• Android and IOS internals

• hooking and instrumentation frameworks,

• and common mobile client security attack vectors.

• Strong proficiency in C/C++ and at least one mobile native language (Java/Kotlin for Android or Objective‑C/Swift for iOS), including experience shipping production code in large apps.

• Demonstrated experience designing and shipping client-side anti-cheat or integrity systems that integrate with server-side enforcement or analytics pipelines.

• Prior experience ing or technically directing a small engineering team

• Experience working with large-scale telemetry or anti-abuse pipelines and using data to tune detections and reduce false positives.

• Professional proficiency in both Mandarin and English, written and spoken

• Requires five days per week in the office

• Requires relocation to Tokyo

Bonus Points

• BS / MS in Computer Science or Software Engineering or equivalent

• Experience shipping and securing mobile games or other large-scale consumer apps specific to the China market, specific exposure to:

• multiple Android app-store ecosystems and OEM variations,

• desktop/mobile emulator usage patterns,

• and tooling development experience specific for china mobile games

• Previous CTF experience, and CVE contributing experience

• Prior work on client obfuscation / hardening pipelines, including vendor evaluation and integration, and handling performance and stability tradeoffs.

• Familiarity with large-scale cloud environments, streaming data processing, and monitoring/alerting

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